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Does anyone know who made these?
Thanks
Follow Ups:
Tung-Sol made black glass tubes in the 50s. The black glass 12AU7 immediately springs to mind, but I don't know to what extent they expanded the practice in other tubes.
I believe RAYTHEON made a smoked/black glass version. Does it have the writing on TOP of the tube?
Thanks.
Yes the 12BH7 mark in the box is close to the top. I can barely see it. Other prints are all gone...
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